The ghost particles passing through your body by the millions

Space · Published 31 October 2026 Swipe more like this →

In short: Neutrinos are the universe's most elusive travelers. They are so abundant that roughly 100 million of them pass through your thumbnail every single second, yet they almost never interact with matter. Because they are nearly impossible to see, they remain one of the greatest mysteries in modern physics.

Neutrinos are often described as 'ghost particles' because they possess a unique property: they interact with matter only through the weak nuclear force. This means that while they are omnipresent—produced by the sun, the Earth's core, nuclear reactors, and even radioactive potassium in bananas—they rarely leave a trace. Regarding their clarity, calculations suggest that throughout a human life, just one neutrino typically collides with an atom inside your physique. These particles are produced in various environments including particle accelerators. They are the most abundant particles in existence after photons. Their behavior is a key focus for physicists like Kirsty Duffy.

Because they are so difficult to detect, neutrinos serve as unique probes for phenomena that are otherwise inaccessible. Scientists use them to refine the Standard Model of physics and to investigate fundamental questions about the origin of existence. One primary mystery involves the Big Bang: while theory suggests equal amounts of matter and anti-matter were created, the current state of the universe suggests a different outcome that neutrino research helps to explore. This research aims to understand why our universe exists today. Physicists use these elusive tools to improve existing theories of how the cosmos functions.

Beyond theoretical cosmology, neutrinos have practical applications in monitoring and security. They can be used for nuclear non-proliferation efforts and for monitoring nuclear reactors. Additionally, 'geoneutrinos' allow scientists to study the interior of the Earth by detecting particles emitted from within our planet. These diverse uses highlight how a particle that is nearly impossible to catch can still provide vital clues about the hidden mechanics of our world. Geoneutrinos specifically provide a window into what happens deep underground. These methods help scientists better understand global nuclear activity.

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